On Dec. 8 at the MGM Grand in Las Vegas, former eight-division world champion Manny Pacquiao will meet Juan Manuel Marquez in the ring for the fourth time. / Jake Roth, US Presswire for USA TODAY

by USA TODAY

by USA TODAY

On Dec. 8 at the MGM Grand in Las Vegas, former eight-division world champion Manny Pacquiao will meet Juan Manuel Marquez in the ring for the fourth time in a series that has been about as close as you can imagine. Pacquiao won the last two by majority and split decision after a draw in their first fight.

Pacquiao (54-4-2, 38 KOs), coming off a highly controversial loss to Timothy Bradley in June, began his training camp this week at the Wild Card Boxing Club under the tutelage of Hall of Fame trainer Freddie Roach. This time, he says, he wants to leave no doubt about the outcome. "If I can get the fight over easy and quick, why not?" Pacquiao says.

Roach says the reason Pacquiao is "the best fighter of his era" is because he works so hard. This video gives viewers a little taste of that.